Update main.sass

Line 20 has been added and Line 24 is modified.

Before:
![overlap](https://f.cloud.github.com/assets/6987538/2474344/7eb35566-b04a-11e3-86bf-e9480f0d21e9.png)

After:
![overlapfix](https://f.cloud.github.com/assets/6987538/2474348/853bf3fc-b04a-11e3-910e-d0ba3d3a73e3.png)